OCPP Reservation: How Reserving a Charger Actually Works
The ReserveNow and CancelReservation flow, how chargers handle the user-facing reservation experience, and the operational subtleties.
OCPP
23 articles in this category
OCPP LocalAuthList: Offline Charger Operation
How LocalAuthList lets a charger authorize users when the back-end is unreachable. The patterns that work and the trade-offs that come with them.
OCPP-J Example Messages: Ready-to-Use JSON Samples
Copy-paste OCPP-J JSON examples for BootNotification, Heartbeat, StatusNotification, StartTransaction, MeterValues and more, with the wire frame explained.
OCPP Firmware Updates: Pushing Software to Chargers Safely
How OCPP handles firmware updates: the messages, the lifecycle, the security, and the operational reality of pushing updates to chargers in production.
Debugging a BootNotification Rejection: A Live OCPP Walkthrough
See exactly why a charge point gets a Rejected or Pending BootNotification: reproduce it live in a browser, read the frames, and fix each cause.
The OCPP 2.0.1 Device Model: Why It Matters
OCPP 2.0.1's device model is a richer way to represent what a charger is and what it can do. How it works and why it improves on 1.6.
Connect a Virtual Charge Point to Your CSMS (wss://)
Walk the OCPP boot handshake, station id, and subprotocol, then connect a virtual charge point to your CSMS live over wss://, in the browser, no hardware.
OCPP 2.0.1 TransactionEvent: The Unified Session Message
TransactionEvent replaces 1.6's StartTransaction, MeterValues, and StopTransaction with one unified message. How it works and why the change matters.
OCPP Heartbeat and the Connection Lifecycle Explained
How Heartbeat keeps an OCPP connection alive, what happens when it fails, and the connection-recovery patterns that make production deployments robust.
OCPP RemoteStart and RemoteStop: How App-Initiated Sessions Work
When a user starts charging via their phone app, the back-end sends RemoteStart to the charger. Here is how the message works and where it goes wrong.
Common OCPP Errors and What They Mean
A practical guide to the OCPP errors you actually see in production: what each one means, what causes it, and how to fix it.
OCPP MeterValues: What Gets Reported and How Often
MeterValues carries the energy data that drives billing and analytics. What it contains, how often it should fire, and where it goes wrong in production.
OCPP Smart Charging Explained: ChargingProfiles in Practice
How OCPP smart charging works: profiles, schedules, stacking, and the operational realities of controlling charger power output via OCPP.
OCPP Security Profiles: What Each One Means
OCPP defines three security profiles ranging from basic to mutually-authenticated TLS. What each profile actually requires and which to use in production.
How to Test an OCPP Charge Point Without Any Hardware
A practical guide to testing and simulating an OCPP charge point in software, with no charger and no lab. Build a real integration test suite for your CSMS.
OCPP StatusNotification: The Charger State Machine
StatusNotification carries every connector state change. The state machine, the transitions that matter, and what operational dashboards depend on.
Free OCPP Simulators & Charge Point Emulators (2026 Guide)
An honest, verified rundown of free OCPP simulators and charge-point emulators: SteVe, CitrineOS, EVerest, MicroOcpp, and which one fits your test.
OCPP StartTransaction and StopTransaction Explained
The two messages that bracket every charging session in OCPP 1.6, how they relate to billing, and how 2.0.1's unified TransactionEvent changes the model.
OCPP Simulator: Test and Debug OCPP Messages Online (Free)
A free online OCPP simulator to watch charging-station and CSMS messages flow frame by frame: BootNotification, Authorize, TransactionEvent, and more.
OCPP Message Flow: A Full Charging Session, Step by Step
The full OCPP message flow for a charging session, in order: boot, status, authorize, transaction start, MeterValues, stop. Plus a live simulator to replay it.
OCPP BootNotification Message: Fields, Statuses & Fixes
The OCPP BootNotification message explained: every field in 1.6 and 2.0.1, what Accepted/Pending/Rejected mean, and the failure modes that cause outages.
OCPP 1.6 vs 2.0.1 Version Comparison (and 2.1): Which to Choose
OCPP 1.6 vs 2.0.1 vs 2.1 compared: transaction model, security, device model, and V2G, plus which version to pick for a new deployment and how to migrate.
What Is OCPP? The Open Charge Point Protocol Explained
OCPP is how a charging station talks to its back-end. What it is, the messages it carries, how a session flows, and how 1.6, 2.0.1 and 2.1 differ.